Nonlinear Aeroelasticity of Composite Wings.

Abstract

We have developed a scheme that couples the codes for aerodynamic and aeroelastic analyses so that the flowfield and the positions and velocities of points on the lifting surface are predicted simultaneously and interactively. The actual structural dynamic/ aerodynamic coupling is carried out by representing the deflection of the wing as an expansion in terms of a few low-frequency free-vibration modes, especially the ones involved in internal resonances. The time dependent coefficients in this expansion are then regarded as tho generalized coordinates. The aerodynamic loads are also expanded in terms of the linear modes. Integration over the spatial domain reduces the problem to one of several degrees rf freedom governed by ordinary differential equations with generalized forces. An integration scheme is developed and applied to this set of equations.

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Document Details

Document Type
Technical Report
Publication Date
Mar 10, 1997
Accession Number
ADA325525

Entities

People

  • A. H. Nayfeh
  • D. T. Mook

Organizations

  • Virginia Tech

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Aeroelasticity
  • Aircrafts
  • Composite Materials
  • Composite Wings
  • Differential Equations
  • Energy Transfer
  • Engineering
  • Equations
  • Frequency
  • Mechanics
  • Nonlinear Dynamics
  • Nonlinear Systems
  • Resonance
  • Resonant Frequency
  • Vibration
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Control Systems Engineering.